<html>
  <head>
    <title>Start Auto Download file</title>
    <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
    <script>
      $(
        '<a href="data:application/zip;base64,{b64}" download="{download_filename}">',
      )[0].click();
    </script>
  </head>
</html>
